Fabrication of MnO2@Fe rod-like composite with controllable weight ratios of Fe/MnO2 and excellent wideband electromagnetic absorption performance

In this research, we designed a rod-like shaped MnO2/Fe binary composite by loading magnetic Fe nanoparticles on MnO2 rods. The co-existence of MnO2 and Fe shows balanced impedance match and dual magnetic-dielectric loss ability. When MnO2/Fe sample presenting rod-like shape, the dielectric loss ability can be further boosted, owing to the formation of conductive network. After tuning weight ratio of Fe in a suitable value, the minimum reflection loss value (RLmin) can up to 35.0 dB with a matched thickness of 1.5 mm. Meanwhile, the effective frequency absorption region (fE) covers 5.6 GHz. To better understand the electromagnetic attenuation mechanism, the effects of components, microstructure as well as weight ratios on the electromagnetic absorption properties have been discussed in depth.